[MarkSheppard]

USMC helo count at the end of each calendar year on 31 Dec. Useful to help build scenarios, because you'll have an idea of just how much of a certain type the USMC had.

From:
MARINES AND HELICOPTERS 1946 - 1962
By Lieutenant Colonel Eugene W. Rawlins, USMC
HISTORY AND MUSEUMS DIVISION HEADQUARTERS, U. S. MARINE CORPS WASHINGTON, D. C. -- 1976